“Senator Harry Reid’s statement today attacking President-elect Trump is wrong! It is an absolute embarrassment to the Senate as an institution, our Democratic party, and the nation,” Mr. Manchin, West Virginia Democrat, said in a statement released late Friday.

“I want to be very clear, he does not speak for me,” said Mr. Manchin, one of the most conservative Democrats in the upper chamber of the U.S. Congress.

Mr. Reid, Nevada Democrat, lashed out at Americans who backed Mr. Trump, saying they confirmed the ascendance of “hate and bigotry in America.”